Core-grinding machine.



O. b. BRBMER.

CORE GRINDING MACHINE.

APPLICATION FILED MAY 16, 1912.

Patented Dec. 31, 1912.

new

10 core grinding machines and more oscrr'n l nemen,

OF DE KALB, ILLINOIS.

CORE-GRINDING "MACHINE.

Specification of Letters Patent.

Eatented Dec. 31, F912.

Application filed May 16, 1912. Serial No. 697,662i

To all whom it may comern:

Be it known that I, (lsclvn E. Batman, a citizen of the United States, and a resident of the city of De Kalb, county of Deltalb,

5 and State of Illinois, have invented certain and useful Improvements in Core-' Grinding Machines, Isa specification.

My invention relates to improvements in of which the following to a. machine of this character 'hich is adaptedlo taper the ends of cores and thereby render the same of greater utility in the molding processes of a foundry.

The objectsof my a core grinding machine of such a construction as to be capable of tapering cores with but a minimmn ot' exertion on the part of the operator.

invention is to provide.

i l i l l l i i l i i A further object of my invention is to? provide a grinding machine of the character stated which shall be simple of (BOIlSlllltilOll and eiiicient in Operation.

\Vith these objects in View my invention consists in the combinations and arrange mcnts of parts all as will be hereinafter described and claimed' My invention will be best understood by reference to the accom mnying drawings forming a part of this specification and in which the figure ing my invention.

The preferred form of construction as illustrated in the accompanying drawing comprises a frame or pair of standards 1 which are rigidly secured to a suitable bench L. The standards l are each providml with a pair of bearings 2 in which are jourualcd shafts 3 and l. the former being a high speed shaft and the latter a power shaft adapted to drive the high speed shaft The shaft 3 is provided with a spur pinion 5 which meshes with a driving spur gear (3 carricd by the shaft l, the construction bcingobriouslr such that the shaft 15 will rotate at a higher speed than lhc shaft 4. The latter shat't carries a pulley T at one cud and a spur pinion 8 at the other, there [icing a spur gear .llooscly mounted on the shaft 2% and drivcn at a low speed by means o'fihc pinion H as clearly illustrated in the figure. Projecting; laterally from one face oi the spur gcar i) and extending to adjacent one extremal-y oi" the shaft 3 is anarm 10 the free extremity of which is formed into is a perspective view" showing a core grinding machine embodyl i l l i I l l i ii i i i l during the a bearing 11. A stub shaft 12, indicated by dotted lines, is journaled in the bearing 11 and disposed at an angle to the axis cit the shaft. 3. The stub shaft 12' is rotated'at approximately the same speed as the shaft 3 by means of with comprising bevel gears 13 and 34. rom this construction it is apparent that operation of the machine that the'shaft 3 will rotate at a high speed'aiid that the spur gear 9 and arm 10 carried thereby will revolve at a low speed, the stub shaft. 11 rotating at approximately the some speed asthe shaft- 3. Secured to the end of the stub shatt ll opposite the bevel gear connection thereof is a wheel 15, which disposed at an acute angle to the-axis of the shaft 3, said ails intersecting the grinding face of said wheel. Thus the grinding not only rotate at ii high speedon its own axis but to revolve bodily about the axis of the shaft 3, forming a planetaryIncrement In order to form a taper 16 on a cylindrical core 17 the latter is placed in a core support comprising a V-shzrpecl holder 18 the sides of which extend horizontally. The holder 15 is so mounted that cores supported thereby may be arranged in axial alincnicnt with the desired result when the into contactwith the grinding face of the wheel. in order tocti'ect vertical adjustment of the core holder 18 which is necessarjl' where cores of varying diameter are ground a slotlcd arm 19 is formed integral with said holder and adjustably secured to a standard it) by means oi a set screw 21. he full ('U.flstruction ol the set screw 21 is not illnstralcd but the same will be readily understood by those skilled in the art.

in the operation of the n'iachine is placed in the holder 18 contact with the grinding surface. of the wheel 15') which tlwreupon begins to grinl lapcr on one end of the core, the lmigth or size of the taper depending; upon the time of contact and pressure between the grinding face and core. The opera-tor merely holds the core in the holder IS and feeds the same longitudinally as the taper is heir ground. lieforc grinding a core it is sary. toyertically adjustthe holder 18 so that the axis of the core to be ground will he in axial alinenoent with the shaft 3.

A core grinding machine as setforth i'nay sa me are pressed a core 17 and brought into grinding dish or' wheel 15 is adapted to the shaft 3 and thus eficct be operated by any one unskilled in grinding cores since the'n'iounting of the grinding wheel of the machine such that true taper is automatically forme l, is moreover simple of construction highly etlicient in operation.

While I have illustrated and described the preferred form of construction for carrying my invention into ctt'eot this is capable o't variation and mmlification without depart ing from the spirit of the invention. 1, tl'iereliore, do not wish to be limited to the precise details oat construction set forth, butdesire to avail myself of such variations and n'iodifirations as come within the scope ot the appended claims.

llavingdescribed my invention what I claim as new and desire to secure by Letters Patent is.

.1V in a core grinding machine,

and

a. driving shaft, a driven shatt operatively COIlllOtJl'Qtl to said driving shatt', a member ournaled on said driven shaft and gear connected with said driving shaft to revolve more slowly than said driven shaft; an arm on said member; a grimling wheel journaled in id arm and operatively connected with said driven shaft to be revolved on its axis thereby; and a (fOlt support adapted to sup-- port a core in axial alinement with said driven shaft, substantially as described.

2. In a core grinding machine, a bearing; and a. shaft. journaled therein, a spur gear loosely mounted on said shaft and having an arm projecting from one side thereof, the extremity of said arm being adjacent an extremity of said shaft and formed into a. hearing,'a shaft journaled in said last mentioned bearing and arranged in operative relation with said extremity of saidsnaitt, the axes of said shafts being disposed. at an angle to each other, a grinding wheel carried by the shaft journaled in the hearing of said arm, means tor-rotating said spur gea and said first mentioned shaft, and a core support adapted to hold cylindrical cores in axial alinelnent with said first mentioned shaft and in contact with the grinding face of said Wheel, substantially as described.

an 3. In a core grinding machine, the con1bi= reins-co alincmcnt with a core on said support, means The machine i means for driving said spur gear l l l a high speed, a on said shaft, at a low speed, an. arm rigidly connected with one face of said spur gear and projecting laterally therefrom to adjacent one end of said for driving said shalt at spur gear loosely mounted 'shatt, there being a bearing termed in the tree extireinity of said arm, a stub shat't jourhalt-d in said bearing; and arranged in operative relation with said first. mentioned shaft, and a grinding wheel carried by said stub shall and adapted to revolve therewith about the 'is of said first mentioned shaft, the disposition of said core support being such. that a core mounted thereon may be placed in operative relation with the grinding tare oi said wheel, substantially as described.

t. ln a core {grinding machine, a frame and a pair of parallel shafts journaled therein, one oi said shafts being a power shaft and the othea high speed shaft geared to the power sha'lit a spur gear loosely mounted on sold high speed shalt, a spur pinion can ried by said power shaft meshing with said. spur gear, an arm projecting laterally from said spur gear having a hearing at the tree extremity thereof, the disposition of said heziring being spaced apart from the axis of said second shaft and adaptedto revolve thercabout, a stub shaft journaled ins'aid bearing and arranged in beyel gea r connec tion with said second shartt, a grinding wheel carried by said stub shaft the grinding face thereof intersecting the axis of said second shaft, and a vertically adjustable core suppore adapted to hold cylindrical cores in rontart with the grinding taco t said wheel and in substantial alinement with said sccond shalt, substantially as described.

.ln testimony whereof l have signed my name to this specification in the presence of two subscribing witiiesses.

O 936 AR E. BBEMER.

lliti'iesses:

Oscar. \VALLIN, -l on C. iiinnmn. 

